4.5. Units and Constants in MedeA

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4.5.1. Units

Quantity Symbol Units in SI units
amount mol mole 1.0 mol
caacitance F farad 1.0 F
electric charge C coulomb 1.0 C
electric conductance S siemens 1.0 S
electric current A ampere 1.0 A
electric potential V volt 1.0 V
electric resistance ohm ohm 1.0 ohm
energy E rel rest energy of electron 8.187111E-14 J
  Ha hartree 4.359748E-18 J
  J joule 1.0 J
  Ry rydberg 2.179874E-18 J
  btu british thermal unit 1.054350E+03 J
  cal calorie 4.184000E+00 J
  eV electronvolt 1.602177E-19 J
  erg erg 1.000000E-07 J
energy density Pa pascal 1.0 Pa
  bar bar 100000.0 Pa
force N newton 1.0 N
  dyn dyne 1.000000E-05 N
frequency Hz hertz 1.0 Hz
inductance H henry 1.0 H
length      
  Ang Angstrom 1E-10 m
  bohr bohr 5.291773E-11 m
  ft foot 3.048000E-01 m
  in inch 2.540000E-02 m
  l rel length unit relativistic 3.861593E-13 m
  m meter 1.0 m
  mi mile 1.609344E+03 m
  rd rod 5.029200E+00 m
  ua astronomical unit 149598000000.0 m
  yd yard 9.144000E-01 m
magnetic flux Wb weber 1.0 Wb
magnetic flux density T tesla 1.0 T
mass g gram 0.001 kg
  kg kilogram 1.0 kg
  lb pound 4.535924E-01 kg
  t ton 1000.0 kg
  u unified atomic mass unit 1.6605402E-27 kg
moment of force E rel rest energy 8.187111E-14 J of electron
  Ha hartree 4.359748E-18 J
  J joule 1.0 J
  Ry rydberg 2.179874E-18 J
  btu british thermal unit 1.054350E+03 J
  cal calorie 4.184000E+00 J
  eV electronvolt 1.602177E-19 J
  erg erg 1.000000E-07 J
plane angle degree 1.745329E-02 rad
  angular minute 2.908882E-04 rad
  rad radian 1.0 rad
  deg degree 1.745329E-02 rad
power W watt 1.0 watt
pressure Pa pascal 1.0 Pa
  bar bar 100000.0 Pa
solid angle sr steradian 1.0 sr
temperature K Kelvin 1.0 K
  C deg Celsius 1.0 K
  F deg Fahrenheit 5.555556E-01 K
time d day 86400.0 s
  h hour 3600.0 s
  min minute 60.0 s
  s second 1.0 s
volume L liter 1.0 s

4.5.2. Constants

Constant Description in SI units
Eh Hartree energy 4.359748E-18 J
G gravitational constant 6.672590E-11 m^3/(kg*s^2)
Na Avogadro constant 6.022137E+23 1/mol
R molar gas constant 8.314510E+00 m^2*kg/(mol*K*s^2)
Ralpha Rydberg constant 1.097373E+07 1/m
Vm molar volume of ideal gas 2.241410E-02 m^3/mol
a0 Bohr radius 5.291773E-11 m
alpha fine structure constant 7.297353E-03 1
atm standard atmosphere 101325.0 Pa
c speed of light in vacuum 299792458.0 m/s
e elementary charge 1.602177E-19 C
eps0 permittivity of vacuum 8.854188E-12 A^2*s^4/(m^3*kg)
gamma Euler’s constant 5.772157E-01 1
gn standard acceleration of gravity 9.806650E+00 m/s^2
h Planck constant 6.6260755E-34 m^2*kg/s
hbar Planck constant / 2pi 1.054573E-34 m^2*kg/s
k Boltzmann constant 1.380658E-23 m^2*kg/(K*s^2)
lambdac Compton wavelength 2.426311E-12 m
me electron mass 9.109390E-31 kg
mp proton mass 1.672623E-27 kg
mu0 permeability of vacuum 1.256637E-06 m*kg/(A^2*s^2)
re classical electron radius 2.817941E-15 m
ub Bohr magneton 9.274015E-24 m^2*A
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